<template>
    <div>
     <!-- 面包屑导航 -->
     <el-breadcrumb separator="/">
       <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
       <el-breadcrumb-item>商品管理</el-breadcrumb-item>
       <el-breadcrumb-item>分类参数</el-breadcrumb-item>
     </el-breadcrumb>
     <!-- 卡片视图 -->
     <el-card>
         <!-- 警告区域 -->
         <el-alert
           title="注意：只允许为第三级分类设置相关参数"
           type="warning"
           show-icon :closable="false">
         </el-alert>
         <!-- 选择商品分类 -->
         <el-row class="cat_opt">
             <el-col>
                 <span>选择商品分类：</span>
                 <!-- 选择商品分类的级联选择框 -->
                 <el-cascader
                    v-model="selectedCateKeys"
                    :options="catelist"
                    :props="cateProps"
                    @change="handleChange"
                    clearable></el-cascader>
                 <!-- tab页签 -->
                  <el-tabs v-model="activeName" @tab-click="handleClick">
                    <!-- 添加动态参数的面板 -->
                    <el-tab-pane label="动态参数" name="many">
                        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加参数</el-button>
                        <!-- 动态参数表格 -->
                        <el-table :data="manyTableData" border stripe>
                            <!-- 展开行 -->
                            <el-table-column type="expand">
                              <template slot-scope="scope">
                                 <!-- 循环渲染tag标签 -->
                                 <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                 <!-- 输入文本框 -->
                                 <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                  >
                                  </el-input>
                                  <!-- 添加按钮 -->
                                  <el-button v-else class="button-new-tag" size="small"                        @click="showInput(scope.row)">+ New Tag</el-button>
                              </template>
                            </el-table-column>
                            <!-- 索引列 -->
                            <el-table-column type="index"></el-table-column>
                            <!-- 参数名称 -->
                            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                            <!-- 操作 -->
                            <el-table-column label="操作">
                                <template slot-scope="scope">
                                   <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                   <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                                </template>
                            </el-table-column>
                        </el-table>
                    </el-tab-pane>
                    <!-- 添加静态属性的面板 -->
                    <el-tab-pane label="静态属性" name="only">
                        <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                        <!-- 静态参数表格 -->
                        <el-table :data="onlyTableData" border stripe>
                            <!-- 展开行 -->
                            <el-table-column type="expand">
                              <template slot-scope="scope">
                                 <!-- 循环渲染tag标签 -->
                                 <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                 <!-- 输入文本框 -->
                                 <el-input
                                    class="input-new-tag"
                                    v-if="scope.row.inputVisible"
                                    v-model="scope.row.inputValue"
                                    ref="saveTagInput"
                                    size="small"
                                    @keyup.enter.native="handleInputConfirm(scope.row)"
                                    @blur="handleInputConfirm(scope.row)"
                                  >
                                  </el-input>
                                  <!-- 添加按钮 -->
                                  <el-button v-else class="button-new-tag" size="small"                        @click="showInput(scope.row)">+ New Tag</el-button>
                              </template>
                            </el-table-column>
                            <!-- 索引列 -->
                            <el-table-column type="index"></el-table-column>
                            <!-- 参数名称 -->
                            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                            <!-- 操作 -->
                            <el-table-column label="操作">
                                <template slot-scope="scope">
                                   <el-button type="primary" size="mini" icon="el-icon-edit" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                   <el-button type="danger" size="mini" icon="el-icon-delete" @click="removeParams(scope.row.attr_id)">删除</el-button>
                                </template>
                            </el-table-column>
                        </el-table>
                    </el-tab-pane>
                  </el-tabs>
             </el-col>
         </el-row>
     </el-card>
     <!-- 添加参数/添加属性 共用对话框 -->
     <el-dialog
        :title="titleText"
        :visible.sync="addDialogVisible"
        width="50%" @close="addDialogClose">
        <!-- 添加参数的对话框 -->
        <el-form ref="addFormRef" :model="addForm" label-width="100px" :rules="addFormRules">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="addDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
      </el-dialog>
      <!-- 编辑-修改参数-对话框 -->
      <el-dialog
        :title="titleText"
        :visible.sync="editDialogVisible"
        width="50%" @close="editDialogClose">
        <!-- 添加参数的对话框 -->
        <el-form ref="editFormRef" :model="editForm" label-width="100px" :rules="editFormRules">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="editDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
      </el-dialog>
    </div>
</template>
<script>
export default {
  data () {
    return {
      catelist: [],
      // 级联选择器配置
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover',
        checkStrictly: true
      },
      // 级联选择框双向绑定到的数组
      selectedCateKeys: [],
      // tab页签默认展示页
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态属性数据
      onlyTableData: [],
      // 添加 参数/属性 对话框 显示隐藏
      addDialogVisible: false,
      // 对话框表单数据
      addForm: {
        attr_name: ''
      },
      // 对话框表单数据，校验规则
      addFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
          { min: 1, max: 8, message: '长度在 1 到 8 个字符', trigger: 'blur' }
        ]
      },
      // 控制 编辑对话框 显示与隐藏
      editDialogVisible: false,
      // 编辑-对话框表单数据
      editForm: {
        attr_name: ''
      },
      // 编辑-对话框表单数据，校验规则
      editFormRules: {
        attr_name: [
          { required: true, message: '请输入参数名称', trigger: 'blur' },
          { min: 1, max: 8, message: '长度在 1 到 8 个字符', trigger: 'blur' }
        ]
      },
      // 控制按钮与文本框的切换显示
      inputVisible: false,
      // 文本框中输入的内容
      inputValue: ''
    }
  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取所有的商品分类列表-失败')
      } else {
        this.catelist = res.data
        // console.log(this.catelist)
      }
    },
    // 抽取出来，方便级联和tab页签调用
    async getParamsData () {
      // 根据所选分类的Id，和当前所处的面板，获取对应参数
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('获取动态静态数据失败')
      } else {
        // 将attr_vals加工处理一下
        res.data.forEach(item => {
          item.attr_vals = (item.attr_vals ? item.attr_vals = item.attr_vals.split(' ') : [])
          // 控制文本框的显示与隐藏
          item.inputVisible = false
          item.inputValue = ''
        })
        // console.log(res.data)
        // 判断是动态的，还是静态的
        if (this.activeName === 'many') {
          this.manyTableData = res.data
        } else {
          this.onlyTableData = res.data
        }
      }
    },
    // 级联选择框选中项变化触发
    handleChange () {
      // 选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return this.$message.error('请选择三级分类')
      } else {
        // console.log(this.selectedCateKeys)
        this.getParamsData()
      }
    },
    // tab页签点击事件的处理函数
    handleClick () {
      // console.log(this.activeName)
      this.getParamsData()
    },
    // 监听对话框的关闭事件
    addDialogClose () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        // 永远记住一点，表单点确定要validate校验
        if (!valid) {
          return this.$message.error('校验不通过')
        } else {
          // 校验通过，发起网络请求
          const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
            attr_name: this.addForm.attr_name,
            attr_sel: this.activeName
          })
          if (res.meta.status !== 201) {
            return this.$message.error('添加参数失败')
          } else {
            this.$message.success('添加参数成功')
            this.addDialogVisible = false
            this.getParamsData()
          }
        }
      })
    },
    // 编辑对话框-展示
    async showEditDialog (attrId) {
      const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attrId}`, {
        params: { attr_sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取参数信息失败')
      } else {
        this.editDialogVisible = true
        this.editForm = res.data
      }
    },
    // 编辑对话框-关闭事件
    editDialogClose () {
      this.$refs.editFormRef.resetFields()
    },
    // 编辑对话框-确定按钮
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        // 永远记住一点，表单点确定要validate校验
        if (!valid) {
          return this.$message.error('校验不通过')
        } else {
          // 校验通过，发起网络请求
          const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
          if (res.meta.status !== 200) {
            console.log(this.editForm)
            console.log(res)
            return this.$message.error('修改/编辑参数失败')
          } else {
            this.$message.success('修改/编辑参数成功')
            this.editDialogVisible = false
            this.getParamsData()
            console.log('执行到刷新数据')
          }
        }
      })
    },
    // 根据id删除对应的参数项
    async removeParams (attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该项, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('取消删除')
      } else {
        // 删除业务逻辑
        const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)

        if (res.meta.status !== 200) {
          return this.$message.error('删除失败')
        } else {
          this.$message.success('删除成功')
          this.getParamsData()
        }
      }
    },
    // 文本框失去焦点，或键盘enter事件都会触发
    async handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
      } else {
        // 客户端发起请求，保存新增tag
        this.saveAttrVals(row)
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
      }
    },
    // 切换文本输入框input
    showInput (sr) {
      // console.log(sr)
      sr.inputVisible = true
      // 自动聚焦文本框 nextTick方法：当页面上元素被重新渲染之后，才会指定回调函数中的代码，思考v-if和v-show
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 删除tag
    handleClose (index, row) {
      console.log(index)
      console.log(row.attr_vals)
      row.attr_vals.splice(index, 1)
      console.log(row.attr_vals)
      this.saveAttrVals(row)
    },
    // 删除tag、添加tag的共同方法抽离
    async saveAttrVals (row) {
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
        {
          attr_name: row.attr_name,
          attr_sel: row.attr_sel,
          attr_vals: row.attr_vals.join(' ')
        })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数项失败')
      } else {
        return this.$message.success('修改参数项成功')
      }
    }
  },
  created () {
    this.getCateList()
  },
  computed: {
    // 如果按钮需要被禁用，则返回true，否则返回false
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      } else {
        return false
      }
    },
    // 当前选中的三级分类的Id
    cateId () {
      if (this.selectedCateKeys.length !== 3) {
        return null
      } else {
        return this.selectedCateKeys[2]
      }
    },
    // 动态dialog的title
    titleText () {
      if (this.activeName === 'many') {
        return '动态参数'
      } else {
        return '静态属性'
      }
    }
  }
}
</script>
<style lang="less" scoped>
.cat_opt {
    margin: 15px 0;
}
.el-tag {
   margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
